[Gllug] Still interpreting output from "sensors"

[Frank Scott]

On Sun, Apr 24, 2005 at 04:14:08PM +0100, John Winters wrote:
> On Sun, 2005-04-24 at 14:39 +0100, Russell Howe wrote:
> > On Sun, Apr 24, 2005 at 01:19:57PM +0100, John Winters wrote:
> > > By default, lm-sensors labels them "M/B temp" and "CPU temp" and once
> > > the machine is warmed up they both hover at about 31 degrees C.  As soon
> > > as I start, for instance, a kernel compilation the one labelled "M/B
> > > temp" leaps up to about 38 degrees C
> > 
> > Could it not be that they're mislabeled and the labels should be the
> > other way round? The behaviour you describe makes me think the 'M/B
> > temp' is the CPU temperature.
> 
> Yes, I'm rather assuming they're mis-labelled - I'm trying to deduce
> what they are from how they behave.
> 
> Can I expect the CPU temperature reading to increase that quickly?

I am surprised by both the value of the temperatures and the rate of
increase.

On my dual Opteron, the 'system' and one of the cpus sit at about 45 deg
( the other cpu has a 1u fan to fit in the case and runs hotter). The
machine is well cooled with a total of 7 fans including 2 120 mm ones.

When the machine is compiling a kernel the cpu temperatures rise by
about 5 deg. over several minutes. The 'system' temp rise is much
smaller.

I presume that the thermal characteristics of the AMD64 and Opterons are
very similar. The AMD data sheet specifies a maximum of 70 deg for my
246s (OSA 246CEP5AL)

Frank

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